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The discussion in §§4 5 leaves RCT in a doubtful position.
– taxa with a doubtful phylogenetic position.
That may seem like a doubtful proposition.
She gave me a doubtful look.
The paper aims not to provide accurate and robust estimates of investment elasticities (a doubtful task given the poor quality of the data sources and the modelling problems), but to develop and critically assess the validity of an empirical approach for characterising the production of science and its impact, from a comparative perspective.
Hang about," he said, with a doubtful frown.
A British summer is usually a doubtful, fleeting thing.
She had been a doubtful starter with a bruised heel.
douarrha had become a nomen dubium — a doubtful name.
I make a doubtful face, but she insists.
Longevity alone strikes me as a doubtful premise.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com